@EstherChapman
You can upgrade anytime after you have had the device for 31 days or more although usually the earlier you upgrade the more it could cost you as the device you currently have does have to be paid off.
You can check this yourself here:
https://www.sky.com/help/articles/sky-mobile-upgrade
__________________________________________________________________________________________
If someone has helped you then please click on the LIKES button in their post.
If you need help please provide as much information as you can
